Objective To investigate the seasonal fluctuation of mosquito density in Liaoning province, China, and to provide a scientific basis for mosquito control and risk assessment, early warning, and prevention and control of mosquito-borne diseases. Methods From 2014 to 2018, mosquito density was monitored by the lamp trapping method from May to October in five mosquito habitats within urban areas (residential areas, parks, and hospitals) and rural areas (rural households and livestock sheds) of Liaoning province. Mosquito composition, density, and seasonal fluctuation were analyzed. Results From 2014 to 2018, a total of 7 000 mosquito traps were set up in Liaoning province and 275 736 mosquitoes were caught. In terms of mosquito species composition, Culex pipiens pallens, Anopheles sinensis, and Cx. tritaeniorhynchus were the top three, accounting for 24.59%, 21.01%, and 19.06% of the total mosquito counts, respectively. The overall mosquito density was 19.70 mosquitoes/lamp·hour. From 2014 to 2018, the mosquito density in each year was 16.75, 26.05, 15.83, 20.23, and 19.65 mosquitoes/lamp·hour, respectively. In terms of mosquito habitats, livestock sheds had the highest mosquito density (72.60 mosquitoes/lamp·hour), while hospitals had the lowest (2.40 mosquitoes/lamp·hour). In each year, the overall mosquito density fluctuated seasonally with a single peak in early or late August. Conclusion For mosquito control in Liaoning province, livestock sheds and rural households are the key places and the May to October period is the key time. Vector mosquito surveillance at each surveillance site should continue to be strengthened to provide a basis for the sustainable control of mosquitoes and mosquito-borne infectious diseases.
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